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m in (-oo:+oo)
(7*m)/4-(2*m)-3 = 0
(7*m)/4-2*m-3 = 0
-1/4*m-3 = 0 // + 3
-1/4*m = 3 // : -1/4
m = 3/(-1/4)
m = -12
m = -12
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